Furnace



Patented Mar. 3, 1931 UNITED sTATss 'PATENT oFFicE I NATHAN E. LEWIS, OF PLAINFIELD,'1\TEW JERSEY, ASSIGNOR, BY MESNE ASSIGN- VIMIENTS, T0 FULLER'LEHIGH COMPANY, A CORPORATION OF DELAWARE rUBNAcn Application flled January 22, 1927. Serial No. 162,913.

Myinvention relates to a system or means for cooling the walls of a furnace, and means for the protection of furnace walls by water tubes connected so that they may be brought into contact with or closely adjacent to one another to absorb the heat from the furnace more readily and to protect the furnace wall more thoroughly. More specifically my in- Vention relates to such a cooling system in which the cooling tubes are alike and inter changeable.

My invention will be best understood from the following description and the annexed drawings of an illustrative embodiment thereof, in which Fig. 1 is a Vertical section' of a furnace wall provided with the Cooling system of my invention; Fig. 2 is an enlarged view of the upper portion of the tubes as shown in F ig. 1, and Fig. 3 is a similar view of the lower portion of the tubes, and Fig. 4 is a section of Fig. 3 on the line Lil- 4.1

Like reference characters indicate llike parts in the several views.

In the illustrative embodiment, a furnace wall 10 is cooled and protected by tubes 11 and 12 which are identical in size and outline and each pf which connects into a lower header 13 and an upper header 14, both of .which are located exteriorly of the wall, and

in this instance are equally offset from the plane of the row of tubes. These tubes and headers are suitably connected to a source of cooling fluid, such as the water of the boiler With which the invention may be used. When used in the cooling system for a steam-boiler,

vthe arrangement may be such that the boiler water enters the lower header 13 through pipe 15, and the mixture of steam and water leaves the upper header through a similar pipe (not shown) that leads back to the boiler.

In the illustrative embodiment, each of the tubes 11 and 12 has one end bent to an angle of about 45 to the main straight portion of the tube and the other end bent at right angles to this vmain portion, each of the bent ends being connected to the main straight portion by a curve of relatively large radius. The tubes are arranged in a row across the furnace wall with their straight portions either in contact or close together, but with each alternate tube having 1ts right-angled portion uppermost and each of the remaining tubes with the 45 bend' uppermost. In the drawings, the former are designated as tubes 12 and the latter as tubes 11.

The bent portions 16 of tubes 12 enter header 14 in a row of holes in plane of the axis of the header and, similarly, the bent portions 17 of tubes 11 enter header 13 in plane of the axis of the header 13. The bent portions 18 'of tubes 11 enter header 14 i.1 a row of holes out of alignment with the holes for the bent portions 16 and, similarly, the bent portions 20 of tubes 12 enter a row of holes in header 13 out ofalignment with the holes for the bent portions 17. By this arrangement, the ho'lesfor any set of tubes entering a header are spaced apart at least two tube diameters and the ligament strength of the header is thus preserved, although the straight portions of the tubes forming the .Cooling projection for the wall may be in conthe row, a subst'antially complete wall will be formed of the cooling tubes alone.

In case the headers 13 and 14 are not paral- 'lel to each other the tubes may be made progressively longer along the headers, thus still' enabling the intermediate portions of the tubes to contact to form a wall, while maintaining the ligament strength of the headers and keeping the bent ends of the tubes located in two planes where they enter a header. I claim: 1. A water cooled wall comprising a pair of headers spaced apart and a plurality of tubes, each having its ends connected to said headers, all of said tubes having the same Shape and length and each having a straight portion and eachof its ends extending at an angle to said straight portion, the angle between one end and the straight portion being substantially a right angle and less than the angle between the other end and the straight portion, said tubes being arranged in a row with the straight portions thereof spaced to form a substantially continuous wall, and adjacent tubes being reversed with respect to each other.

2. A water cooled Wall comprising a pair of headers spaced apart and a plurality of tubes, each having its ends connected to said headers, all of said tubes having the same Shape and length and each having a straight portion and each of its-ends extending at an angle to said straight portion, the angle between one end and the straight portion being greater than the angle between the other end and the straight portion, said tubes being arralrged in arow With the straight portions thereof spaced to form a substantially continuous wall, alternate tubes in the row having the end with the greater angle enteringeone of said headers and the remaining tu s having the end with the lesser angle entering said header. c

3. A water cooled wall comprising a pair of headers spaced apart and a plurality of tubes, each having its ends connected to said headers, all of said tubes having the same Shape and length and each having a straight portion and each having one of its ends extending at right anglesto said straight portion and the other end extending at an obtuse angle to said straight portion, said tubes being arranged in a row with the straight portions thereof s aced to form al substantially' continuous wa and adjacent tubes being reversed with respect to each other.

4. water eooled wall comprising a pair of headers spaced apart and a plurality of tubes, each having its ends connected to said headers, all of said tubes having the same shape and length and each having a straight portion and each having one of its ends extending at right angles to said straight portion and the other end extending at an' obtuse angle to said straight portion, said tubes being arranged in a row with the straight portions thereof spaced to form a substantially continuous wall, alternate tubes in the i row having their obtuse-angled ends entering one of Vsaid headers and the remaining tubes having their right-angled ends entering said header.

NATHAN E. LEWIS. 

